Malicious PDF — malware analysis report

Static analysis result for SHA-256 b845af20d8a716c0…

MALICIOUS

PDF

79.4 KB Created: 2021-09-11 05:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 72a2ead28832b10ef792702dfac2c0c9 SHA-1: 058e6a946b08c127aa99e693cc79cac6d2c18b2e SHA-256: b845af20d8a716c0bdbc3192963b429568cc0438c71c87dbfb50d73a32e1171d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=have+a+beautiful+day+in+spanish PDF link annotation
    • http://bakefruit.com/uploads/files/202109061710323662.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/nasijepufonujirew.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/78287538523.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdad12457a---komudanived.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/merapinagutiruwukoxuza.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/78126231620.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/17867371904.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/65400682320.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109082050592641.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd951bc86---61076866440.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e06e01a6f---regusuxisiwakov.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109050649173330.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/mosorudivesuna.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/6111064427.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/lisute.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/98507835140.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a022ce419c---mesukebakezodidisos.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/xudetefikobux.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/moluwijawiwifif.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/cf507aa1a8a18ae9099ee3d8fee0ecca/garexe.pdfIn PDF document text
    • https://begili.com/uploads/image/files/zopexelaribivewejotiwu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a864230380---95540058323.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/xukususuxuganajam.pdfIn PDF document text
    • https://zzhqhi.com/d/files/28440508727.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/nubasotuvub.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/91083461820.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 10788 bytes
SHA-256: 06e9e28e55d16cf1b944344c3e184ec643c7e71d06b28ba7e0e6975cafebef56
font_01_sfnt_off0000e811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10023 18400 bytes
SHA-256: e444c2e87768f4cdb4c65505e64b07f67370b1d7d8c1bb278fbb5e1fbb4b62a4

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